JPS6137834Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vane compressor used for compressing refrigerant in air conditioners, car coolers, etc.

[Conventional technology]

Conventionally, in this type of vane type compressor, as shown in FIGS. 3, 5, and 6, a plurality of vane grooves 21 are provided in the rotor 2, and a bottom surface 31 of the vane 3 is slidably attached to the vane grooves. During suction and compression strokes in the vane groove space 211 formed by By supplying suction fluid pressure from the balanced groove 8, pressure is applied to the vane bottom surface 31, preventing the vane groove space 211 from becoming negative pressure, and improving the vane protrusion. ing.

On the other hand, in the discharge stroke, the discharge fluid pressure is applied from the discharge port 9, through the introduction passage 7 provided in the center housing 5 and the side housing 6, and finally from the balance groove 81 formed on the inner wall surface of the side housing. Supply to the vane groove space 211 is performed. With this configuration, it is expected that the vane will be prevented from being forced into the vane groove by the compressed fluid in the working chamber 12, thereby preventing fluid leakage and improving compression efficiency. This is what we are doing.

[Problem that the invention attempts to solve]

However, it has been found that even such conventional configurations still have deficiencies.

That is, in the suction stroke, the vane groove space 2
Although the negative pressure at 11 was eliminated, a pressure higher than the suction pressure could not be applied, and the sealing performance between the vane 3 and the inner wall surface of the center housing was insufficient.

Also, the vane 3 enters the compression stroke and moves into the vane groove 21.
As the vane groove space 211 decreases, the pressure acting on the bottom surface 31 becomes excessive, resulting in abnormal wear between the vane 3 and the inner wall surface of the center housing, or breakage of the vane 3. .

That is, during the suction and compression strokes, the frictional force between the vane 3 and the inner wall surface of the center housing was not constant, and stable operation was not performed.

Furthermore, in the compression and discharge strokes, as the fluid sucked into the working chamber is compressed, it reaches the vane groove space 211 through the clearance between the vane groove side surface 22 and the corresponding vane side surface 32, and then, A backflow passage is formed so as to return to the suction port 4 via the balance groove 8 and the introduction passage 7, and as the fluid circulates through this passage, efficiency decreases and the temperature rises due to the circulation of the fluid. I found out that there was.

Therefore, an object of the present invention is to make the vanes move smoothly in and out, and to prevent a decrease in efficiency due to backflow of compressed fluid.

[Means for solving problems]

In order to achieve the above object, according to the present invention, an introduction passage and a first balance groove on the inner wall surface of the side housing following the introduction passage are provided so as to connect the vane groove space of the suction and compression strokes and the suction port. The vane type compressor is provided with a lead-out passage and a second balance groove on the inner wall surface of the side housing following the lead-out passage to connect the vane groove space in the stroke region and the discharge port, and the lead-in passage has an inlet and a second balance groove. A vane compressor is provided in which an outflow check valve is provided, and the outflow check valve is provided in the outlet passage.

Alternatively, in addition to the above configuration, a vane type compressor is provided in which a second outlet passage is provided with a check valve for outflow so as to connect the working chamber in the discharge stroke area and the discharge port. .

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, in the suction and compression stroke regions, an introduction passage 7 branching from the suction port 4 is provided inside the center housing 5 and the side housing 6, and the end of this introduction passage 7 is connected to the side housing. An arcuate first balance groove 8 is provided on the inner wall surface. This first balance groove 8 is a vane groove space 211
Therefore, the intake port 4 and the vane groove space 2
It communicates with 11.

However, an inflow check valve 10 and an outflow check valve 11 are provided in the middle part of the introduction passage 7, and the inflow check valve 10 is opened by the inflow fluid pressure (suction fluid pressure), while the outflow check valve 10 is opened by the inflow fluid pressure (suction fluid pressure). When the valve 11 reaches a pressure higher than the inflow fluid pressure (this pressure higher than the inflow fluid pressure determines the pressure applied to the vane bottom surface 31, the optimum pressure is set depending on the model). Their drag force (critical opening pressure) is set so that they only open.

On the other hand, in the discharge stroke region, first, the arc-shaped second balance groove 8 is connected to the vane groove space 211.
1 is provided on the inner wall surface of the side housing, and communicates with the discharge port 9 via a lead-out passage 20 inside the side housing. An outflow check valve 110 is provided in the middle of the outlet passage, and this opens when the pressure in the vane groove space 211 becomes too excessive to the extent that the vane 3 is difficult to sink smoothly. The drag force is adjusted so that it escapes to 9.

As shown in FIG. 4, the second balance groove 81 is provided with a plurality of small ones, and the lead-out passage 70 is arranged accordingly.
If more than one is used, the responsiveness to excessive pressure will increase.

Preferably, a second outlet passage 71 is provided in the side housing to connect the working chamber 12 and the discharge port 9 in the discharge stroke region, and an outflow check valve 110 is installed at the outlet of the second outlet passage 71. This check valve 110 is activated when the pressure of the fluid compressed in the working chamber becomes excessive, and the fluid passes through the clearance between the vane groove side surface 22 and the vane side surface 32, the vane groove space 211, the first balance groove 8, and the introduction passage 7, and then passes through the suction port. The resistance force is adjusted so that excessive pressure is released to the discharge port 9 so that a backflow path such as returning to the discharge port 4 is not formed.

[Effect]

When the rotor 2 of the compressor rotates (in the direction of the arrow in Fig. 3), the vanes 3 gradually move out in the suction stroke region and negative pressure is generated in the vane groove space 211. Suction fluid is supplied to the vane groove space 211 via the passage 7, the inflow check valve 10, and the first balance groove 8. Although the negative pressure is eliminated by this, a pressure higher than the suction fluid pressure is applied to the vane bottom surface 31 and the vane 3
The outflow check valve 11 is designed to more easily slide against the inner wall of the center housing with a strong force.
is set to open at a higher pressure than the inflow check valve 10. Therefore, the fluid flows into the vane groove space 2
11 and is returned to the suction port 4 via the first balance groove 8, the outflow check valve 11, and the introduction passage 7 only when it reaches a certain high pressure.

On the other hand, when the compression and discharge stroke regions are reached, the pressure within the vane groove space 211 gradually increases, but before this becomes unnecessarily large, the vane groove space 211
The pressure inside the second balance groove 81, the outlet passage 70,
It is opened to the discharge port 9 via the outflow check valve 110.

In addition, when the second outlet passage 71 is formed, the second outlet passage 71 and the outflow check valve 11 are
The fluid in the working chamber 12 is released to the discharge port 9 through the discharge port 9.

[Effect of idea]

The vane type compressor of the present invention is constructed as described above, and in the suction and compression stroke regions, it is possible not only to eliminate the negative pressure in the vane groove space but also to apply high pressure to the bottom surface of the vane. be. Further, during the discharge stroke, excessive pressure in the vane groove space can be alleviated to make it easier for the vane to sink into the vane groove. Similarly, excessive pressure in the working chamber can be released to the discharge port in the discharge stroke region to prevent backflow of the compressed fluid.

Therefore, by appropriately adjusting the drag forces of the four check valves, a compressor with high compression efficiency can be obtained in which the vanes move in and out smoothly and the sliding friction with the inner wall of the side housing is constant throughout the entire stroke.

[Brief explanation of drawings]

Fig. 1 is a front view of the inner wall surface of the side housing of the compressor of the present invention, Fig. 2 is a vertical side view of the compressor of the present invention, and Fig. 3 shows the positional relationship between the center housing, rotor, and vane of the present invention. 4 is a front view showing a modified example of the inner wall surface of the side housing of the compressor of the present invention, FIG. 5 is a vertical sectional side view of the conventional compressor, and FIG. 6 is the conventional compressor. FIG. 3 is a front view of the inner wall surface of the side housing of the compressor. 211... Vane groove space, 4... Suction port, 6...
...Side housing, 7...Introduction passage, 8...First arc-shaped supply hole, 81...Second arc-shaped supply hole, 9
...Discharge port, 70... Outlet passage, 71... Second outlet passage, 10... Inflow check valve, 11,110
...Outflow check valve, 12...Working chamber.

Claims (1)

[Claims for Utility Model Registration] (1) An introduction passage and a first balance groove on the inner wall surface of the side housing following the introduction passage are provided so as to communicate the vane groove space in the suction and compression stroke areas with the suction port;
The vane type compressor is provided with a lead-out passage and a second balance groove on the inner wall surface of the side housing following the lead-out passage so as to communicate the vane groove space in the discharge stroke area and the discharge port, and the lead-in passage has an inflow groove. and an outflow check valve, and the outlet passage is provided with an outflow check valve. (2) In claim 1 of the utility model registration claim, a second outlet passage is provided to connect the working chamber in the discharge stroke area and the discharge port, and the second outlet passage is provided with a reverse outlet for outflow. A vane type compressor characterized by being equipped with a stop valve.